package com.ojoin.weixin.core.oauth2.inteceptor;

import java.io.UnsupportedEncodingException;
import java.lang.reflect.Method;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import com.ojoin.trade.common.utils.CommonUtils;
import com.ojoin.trade.common.utils.LogUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import com.ojoin.weixin.core.oauth2.annotation.OAuthRequired;

/**
 * 认证拦截器
 */
public class OAuth2Interceptor implements HandlerInterceptor {

	private static final Logger logger = LoggerFactory
			.getLogger(OAuth2Interceptor.class);

	/**
	 * 在DispatcherServlet完全处理完请求后被调用
	 * 当有拦截器抛出异常时,会从当前拦截器往回执行所有的拦截器的afterCompletion()
	 */
	@Override
	public void afterCompletion(HttpServletRequest request,
			HttpServletResponse response, Object handler, Exception ex)
			throws Exception {
		if (logger.isDebugEnabled()) {
			logger.debug("afterCompletion(HttpServletRequest, HttpServletResponse, Object, Exception)");
		}
	}

	/**
	 * 在业务处理器处理请求执行完成后,生成视图之前执行的动作
	 */
	@Override
	public void postHandle(HttpServletRequest request,
			HttpServletResponse response, Object arg2, ModelAndView modelAndView)
			throws Exception {
		if (logger.isDebugEnabled()) {
			logger.debug("postHandle(HttpServletRequest, HttpServletResponse, Object, ModelAndView)");
		}
	}

	/**
	 * 在业务处理器处理请求之前被调用 如果返回false 从当前的拦截器往回执行所有拦截器的afterCompletion(),再退出拦截器链
	 * 如果返回true 执行下一个拦截器,直到所有的拦截器都执行完毕 再执行被拦截的Controller 然后进入拦截器链,
	 * 从最后一个拦截器往回执行所有的postHandle() 接着再从最后一个拦截器往回执行所有的afterCompletion()
	 */
	@Override
	public boolean preHandle(HttpServletRequest request,
			HttpServletResponse response, Object handler) throws Exception {

		HttpSession session = request.getSession();
		// 先判断是否有注解
		// 路径拦截问题
		if (handler instanceof HandlerMethod) {

			HandlerMethod handlerMethod = (HandlerMethod) handler;
			Method method = handlerMethod.getMethod();
			OAuthRequired annotation = method
					.getAnnotation(OAuthRequired.class);
			if (annotation != null) {
				LogUtils.info(logger," OAuthRequired：你的访问需要获取登录信息！");

				if(CommonUtils.isDev()){
					return true;
				}

				Object objUid = session.getAttribute(APPConstants.CURRENT_LOGIN_WECHAT);
				if (objUid == null) {
					String resultUrl = request.getRequestURL().toString();
					String param = request.getQueryString();
					if (param != null) {
						resultUrl += "?" + param;
					}

					try {
						resultUrl = java.net.URLEncoder.encode(resultUrl,
								"utf-8");
					} catch (UnsupportedEncodingException e) {
						LogUtils.error( logger,e);
					}
					// 请求的路径
					String contextPath = request.getContextPath();
					LogUtils.info(logger, "oauth2Url=" + contextPath + "/wechat/oauth2?resultUrl="
							+ resultUrl);
					response.sendRedirect(contextPath + "/wechat/oauth2?resultUrl="
							+ resultUrl);
					return false;
				}

			}
		}
		return true;
	}

}